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Characterization of Thermoelectric Metal Oxide Elements Prepared by the Pulse Electric‐Current Sintering Method
Author(s) -
Fujishiro Yoshinobu,
Miyata Motoyuki,
Awano Masanobu,
Maeda Kunihiro
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2004.tb06336.x
Subject(s) - sintering , crystallite , materials science , thermoelectric effect , oxide , doping , electrical resistivity and conductivity , porosity , electric current , metal , composite material , analytical chemistry (journal) , metallurgy , optoelectronics , electrical engineering , chemistry , engineering , physics , thermodynamics , chromatography
Thermoelectric elements consisting of the layered polycrystalline materials of Al‐doped ZnO and NaCo 2 O 4 were prepared using the pulse electric‐current sintering (PECS) method at 900°C for 3 min. Direct contact between the polycrystalline Al‐doped ZnO and the NaCo 2 O 4 was obtained in a single‐step process for the stacked powders. The electrical conductivities of the polycrystalline materials prepared by PECS were higher than those of materials prepared by conventional sintering, despite their porous structure. The thermoelectric voltage of the 1‐mol%‐Al‐doped ZnO and NaCo 2 O 4 polycrystalline element (measuring ∼6 mm × 3 mm × 15 mm) was 83 mV at d T = 500 K, when the junction of the elements was at 800°C.